PROBLEM: You are a web programmer. You have users. Your users rate stuff on your site. You want to put the highest-rated stuff at the top and lowest-rated at the bottom. You need some sort of "score" to sort by.

There are three main platforms within Nokia for social media. The oldest and one of the most important is the BlogHub. Every employee is entitled to have their own internal blog to share their work and ideas and there are more than 1400 in existence and a total of over 100,000 posts and comments. Not all of them are active but enough of them are to make sure there’s always plenty to read about what’s going on around the company. Supporting this space is the VideoHub where employees can watch and share yes… videos.

One of the newest platforms within Nokia is Socialcast, a kind of half-way house between Facebook and Twitter, but designed for internal communications. Like those platforms, there’s a wall of scrolling updates and it’s designed for smaller snippets and quick questions.

The latest version of the Tribler BitTorrent client (Win, Mac and Linux), released only a few minutes ago, is capable of all the above and many more things that could be described as quite revolutionary. The client combines a ‘zero-server’ approach with features such as instant video streaming, advanced spam control and personalized content channels, all bundled into a single application.

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Despite the fact that only a few thousand people are using Tribler on a monthly basis, in technological terms it is one of the most advanced clients. People who install the client will notice that there’s a search box at the top of the application, similar to that offered by other clients. However, when one does a search the results don’t come from a central index. Instead, they come from other peers.

This is a follow up post to How Hacker News ranking algorithm works. This time around I will examine how Reddit's default story and comment rankings work. Reddit's algorithms are fairly simple to understand and to implement and in this post I'll dig deeper into them.

The first part of this post will focus on story ranking, i.e. how are Reddit stories ranked? The second part of this post will focus on comment ranking, which does not use the same ranking as stories (unlike Hacker News), Reddit's comment ranking algorithm is quite interesting and the idea guy behind it is Randall Munroe (the author of xkcd).

The past four years have been a wild ride for us: growing something from nothing to substantial scale, providing a simple service that people love because it simplifies their lives. We’ve learned tons along the way, often by making big mistakes. We’re really sorry that this last lesson means that you’ll have to find an alternative to Xmarks, but the alternatives exist and you’ll have no problem finding them.

Pintley is a new kind of beer website—one that only recommends beer you're sure to love.

Unlike other beer sites, Pintley doesn't just know beer; it also knows you. Pintley learns from your ratings and tasting notes to understand exactly what pleases your palate the most, so you can be your own beer expert.